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Postgres

How to PHP Singleton with different schema Postgres Database connection PDO ?

/**
 * Class StorageService
 *
 * @package App\Core\Services
 */
class StorageService extends \App\Core\Classes\Service
{

    private static $instance = null;
    private $storageConfigs = false;
    private $dbConnections = false;

    public $schema ;
    public $database_host ;
    public $database_port ;
    public $database_name ;
    public $database_user ;
    public $newConnection ;


    public function __construct($schema = 'api')
    {

        $dbConfigs = $this->storageConfigs()['databases'];
        
        $dbConfig = $dbConfigs[$schema];

        $this->schema = $schema;
        $this->database_host = $dbConfig['database_host'];
        $this->database_port = $dbConfig['database_port'];
        $this->database_name = $dbConfig['database_name'];
        $this->database_user = $dbConfig['database_user'];
        $database_password  = $dbConfig['database_password'];
        

        $dsn = "pgsql:host={$this->database_host};port={$this->database_port};dbname={$this->database_name};";
        $pdoOpts =
            [
                \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
                \PDO::ATTR_DEFAULT_FETCH_MODE => \PDO::FETCH_ASSOC
            ];

        try {
            $this->newConnection = new \PDO($dsn, $this->database_user, $database_password, $pdoOpts);

        } catch (\Throwable $e) {

            /**
             * Add Exception error
             *
             * @date July 15th 2021
             * @author David Raleche
             */
            $error = 'MAPI CANT CONNECT DATABASE schema'.$schema
                .' DSN: '.$dsn
                .' USER: '.$this->database_user
                .' PASSWORD'.$database_password
                .' '.(string) $pdoOpts
                . '  ' .$e->getMessage();
            HelperService::logger('critical', $error);
            throw new \Exception('Database connection issue '.$e->getMessage(), 500);
        }



    }


    /**
     * Storage Configs
     *
     * @return bool|mixed
     */
    private function storageConfigs()
    {
        if ($this->storageConfigs === false) {
            $this->storageConfigs = yaml_parse_file(__DIR__ . '/../../config/storage.yaml');
        }
        return $this->storageConfigs;
    }

    /**
     * Get Db connection
     *
     * @param string $schema
     * @param bool $allowShared
     *
     * @return bool|\PDO
     */
    
    public function getConnection() : \PDO
    {
        return $this->newConnection;
    }


    public static function getInstance($schema)
    {
        if(!self::$instance )
        {
            self::$instance = new StorageService($schema);
        }

        if ( self::$instance->schema !== $schema)
        {
            self::$instance = new StorageService($schema);
        }

        return self::$instance;
    }

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